And next our made in america team is back with the simple inventions that can make you a fortune. Americans from coast to coast have sent in videos and walmart is going to give one of them the ride of a lifetime. You can help choose. The captain of our made in america team david muir cheering them on. And having a blast. We reported on the thousands of dollars spent by american inventors on patent but the promise of no retail would notice. Tonight they have. The stakes are enormous as they make their pitch before america's biggest retailer and we're the only ones there. Reporter: For more than two years now "world news" on this made in america journey cheering on so many americans certain they got the next big thing. Tonight their big shot. Thousands from every corner of this country sending in their home spun videos, their pitches, all for a chance at getting their product on the shelf in front of millions at walmart. This is could be a big success. Reporter: One of them will. "World news" viewers, all of you at home will help judge, some of the pitches making a smile. The spray and squeegee in one. Look how happy she seems now at her front door. Then there was the hands free umbrella holder. You heard me right. Then to the problems we all have, getting that last bit of toothpaste. Attach this. It's made in america. And those disappearing socks in the washer and drier, give your kids a sock sack. Put the socks in, zip it up and throw the whole thing in the washer. You'll get every one of those socks back. But then the inventions that locked us in like the smart lock that senses you're coming home linked up with your smaert phone, it automatically unlocks your front door, no fumbling for keys. We had to see this invention on a front door in san francisco and one of their first customers, jonathan. You're fumbling for your keys every time you come home? Yes. Reporter: About to look for those keys no longer. Press this unlock button. Reporter: Look at the message, welcomejohn, as it unlocks. And it cap tours an image of every visitor at your front door. If you are not home and a loved one visits, you can unlock the door from your smart phone. Even if you are halfway around the world. Or around the corner. Reporter: If we come back for another made in america visit and the door lock sees this, would they let us in? They said come on back. Reporter: In the meantime we are driving to california and right to this driveway. Convinced she's going to win with this pet locator. Put it on your dog's collar. Here's her pitch. It's simple how it works. You attach it to your dog's collar. If your dog goes missing, go to our app, press the button and up pops a google map with the location of your dog. Reporter: Look at how many neighbors and dogs showed up when we did. That's calla and enzero. Reporter: So many of them we lost count but not their parents who with this device will know their dog's every move. This will track him on your iphone? Yes. Reporter: Now comes the hard part, the pitch in person. They're getting ready. Reporter: "World news" documenting their trips to walmart headquarters, about to go before the judges and we're the only ones invited in. Tomorrow night the pitch that brought the judges to tears and a fear factor. Very, very hard here. Reporter: The stakes, the sweat. Are you going to be okay? Reporter: No do overs here. Your front row seats beside the judges tomorrow. That's tomorrow night. You'll meet the judges as well. If you think you've seen shark tank, wait for this, diane. After our viewers see these pitches, they will be able to vote at home. Everyone's vote counts on this one. Can't wait to see it. Thank you, david.

This transcript has been automatically generated and may not be 100% accurate.

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